Mössbauer study on crystallization transformation in amorphous Fe90Zr10 alloy ribbon

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Abstract
The difference in the crystallization transformation of amorphous Fe90Zr10 alloy ribbon between the bulk and the surface has been investigated by means of transmission and conversion electron Mössbauer spectrometries. It is found that the ribbon surface crystallizes at 473 K, which is 340 K lower than the crystallization temperature of the bulk. It is confirmed that the remarkable drop in the onset temperature results from the formation of Zr‐deficient amorphous phases induced by the absorption and diffusion of a large amount of oxygen. The final crystalline products in the bulk are assigned as α‐Fe, Fe3Zr, and Fe2Zr, whereas both surfaces of the ribbon are overlaid with only α‐Fe. Further, the study of the ambient atmosphere during annealing shows that air stimulates the crystallization transformation of the bulk and that the crystallization behavior in air is quite different from that in a vacuum.